1 /* NVS: non volatile storage in flash 2 * 3 * Copyright (c) 2018 Laczen 4 * 5 * SPDX-License-Identifier: Apache-2.0 6 */ 7 #ifndef __NVS_PRIV_H_ 8 #define __NVS_PRIV_H_ 9 10 #ifdef __cplusplus 11 extern "C" { 12 #endif 13 14 /* 15 * MASKS AND SHIFT FOR ADDRESSES 16 * an address in nvs is an uint32_t where: 17 * high 2 bytes represent the sector number 18 * low 2 bytes represent the offset in a sector 19 */ 20 #define ADDR_SECT_MASK 0xFFFF0000 21 #define ADDR_SECT_SHIFT 16 22 #define ADDR_OFFS_MASK 0x0000FFFF 23 24 /* 25 * Status return values 26 */ 27 #define NVS_STATUS_NOSPACE 1 28 29 #define NVS_BLOCK_SIZE 32 30 31 #define NVS_LOOKUP_CACHE_NO_ADDR 0xFFFFFFFF 32 33 /* Allocation Table Entry */ 34 struct nvs_ate { 35 uint16_t id; /* data id */ 36 uint16_t offset; /* data offset within sector */ 37 uint16_t len; /* data len within sector */ 38 uint8_t part; /* part of a multipart data - future extension */ 39 uint8_t crc8; /* crc8 check of the entry */ 40 } __packed; 41 42 BUILD_ASSERT(offsetof(struct nvs_ate, crc8) == 43 sizeof(struct nvs_ate) - sizeof(uint8_t), 44 "crc8 must be the last member"); 45 46 #ifdef __cplusplus 47 } 48 #endif 49 50 #endif /* __NVS_PRIV_H_ */ 51
